Pet Travel Scheme is available for F2 and later generations. Hybrids have to go into a 6 month quarantine; for F1 a wild cat license is required. See: http://www.defra.gov.uk/animalh/quarantine/PETS/dangerousdogs.htm
In order to import to Europe CITES import and export permits are required for F1 – F4 hybrids. From F5 on no CITES is needed, instead a TICA 5 generation pedigree to prove the cat is 5 generations removed from the wild cat. There are different regulations in each country for keeping hybrids.